1.  nullify(v = verb.social) annul, avoid, invalidate, quash, void - declare invalid; "The contract was annulled"; "void a plea"
is one way to cancel, strike down
Derived forms noun nullification₂, noun nullification₁, noun nullifier₂, noun nullifier₁
Sample sentences: Somebody ----s something; Something ----s something

2.  nullify(v = verb.cognition) invalidate - show to be invalid;
is one way to contradict, negate
Sample sentences: Somebody ----s something; Something ----s something

3.  nullify(v = verb.change) negate, neutralise, neutralize - make ineffective by counterbalancing the effect of; "Her optimism neutralizes his gloom"; "This action will negate the effect of my efforts"
is one way to weaken
Derived form noun nullification₂
Sample sentences: Somebody ----s something; Something ----s something

   To make void; to render invalid; to deprive of legal force or efficacy. [1913 Webster]
"Such correspondence would at once nullify the conditions of the probationary system." [1913 Webster]

nullify, v.tr. (-ies, -ied) make null; neutralize, invalidate, cancel.

Derivative:
nullification n. nullifier n.

VB  not exist, have no existence, be null and void, cease to exist, pass away, perish, be extinct, become extinct, die out, disappear, melt away, dissolve, leave not a rack behind, go, be no more, die, annihilate, render null, nullify, abrogate, destroy, take away, remove, obliterate, extirpate.

VB  make compensation, compensate, compense, indemnify, counteract, countervail, counterpoise, balance, outbalance, overbalance, counterbalance, set off, hedge, square, give and take, make up for, lee way, cover, fill up, neutralize, nullify, equalize, make good, redeem.

VB  abrogate, annul, cancel, destroy, abolish, revoke, repeal, rescind, reverse, retract, recall, abolitionize, overrule, override, set aside, disannul, dissolve, quash, nullify, declare null and void, disestablish, disendow, deconsecrate, disclaim, ignore, repudiate, recant, divest oneself, break off, countermand, counter order, do away with, sweep away, brush away, throw overboard, throw to the dogs, scatter to the winds, cast behind, dismiss, discard, cast off, turn off, cast out, cast adrift, cast out of doors, cast aside, cast away, send off, send away, send packing, send about one's business, discharge, get rid of, bounce, fire, fire out, sack, cashier, break, oust, unseat, unsaddle, unthrone, dethrone, disenthrone, depose, uncrown, unfrock, strike off the roll, disbar, disbench, be abrogated, receive its quietus, walk the plank.

VB  fail, neglect, omit, elude, evade, give the go-by to, set aside, ignore, shut one's eyes to, close one's eyes to, infringe, transgress, violate, pirate, break, trample under foot, do violence to, drive a coach and six through, discard, protest, repudiate, fling to the winds, set at naught, nullify, declare null and void, cancel, retract, go back from, be off, forfeit, go from one's word, palter, stretch a point, strain a point.

VB  not pay, fail, break, stop payment, become insolvent, become bankrupt, be gazetted, protest, dishonor, repudiate, nullify, refuse payment, pay under protest, button up one's pockets, draw the purse strings, apply the sponge, pay over the left shoulder, get whitewashed, swindle, run up bills, fly kites.

VB  be destroyed, perish, fall to the ground, tumble, topple, go to pieces, fall to pieces, break up, crumble to dust, go to the dogs, go to the wall, go to smash, go to shivers, go to wreck, go to pot, go to wrack and ruin, go by the board, go all to smash, be all over, be all up, be all with, totter to its fall, destroy, do away with, make away with, nullify, annual, sacrifice, demolish, tear up, overturn, overthrow, overwhelm, upset, subvert, put an end to, seal the doom of, do in, do for, dish, undo, break up, cut up, break down, cut down, pull down, mow down, blow down, beat down, suppress, quash, put down, do a job on, cut short, take off, blot out, dispel, dissipate, dissolve, consume, smash, crash, quell, squash, squelch, crumple up, shatter, shiver, batter to pieces, tear to pieces, crush to pieces, cut to pieces, shake to pieces, pull to pieces, pick to pieces, laniate, nip, tear to rags, tear to tatters, crush to atoms, knock to atoms, ruin, strike out, throw over, knock down over, fell, sink, swamp, scuttle, wreck, shipwreck, engulf, ingulf, submerge, lay in ashes, lay in ruins, sweep away, erase, wipe out, expunge, raze, level with the dust, level with the ground, waste, atomize, vaporize, deal destruction, desolate, devastate, lay waste, ravage gut, disorganize, dismantle, devour, swallow up, sap, mine, blast, bomb, blow to smithereens, drop the big one, confound, exterminate, extinguish, quench, annihilate, snuff out, put out, stamp out, trample out, lay in the dust, trample in the dust, prostrate, tread under foot, crush under foot, trample under foot, lay the ax to the root of, make short work of, make clean sweep of, make mincemeat of, cut up root and branch, chop into pieces, cut into ribbons, fling to the winds, scatter to the winds, throw overboard, strike at the root of, sap the foundations of, spring a mine, blow up, ravage with fire and sword, cast to the dogs, eradicate.